Backpack



FIG. 1 is a front perspective view of the backpack, shown with a detachable carrying case removed, comprising the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a front open interior view thereof;

FIG. 9 is a front perspective alternative view thereof with a detachable carrying case;

FIG. 10 is a front view thereof with the detachable carrying case;

FIG. 11 is a right side view thereof with the detachable carrying case;

FIG. 12 is left side view thereof with the detachable carrying case;

FIG. 13 is a top view thereof with the detachable carrying case;

FIG. 14 is a bottom view thereof with the detachable carrying case;

FIG. 15 is a front perspective exploded view with the detachable carrying case; and,

FIG. 16 is a rear view of the detachable carrying case.

The broken lines showing stitching do not form part of the claimed design. All other broken lines shown in the drawings illustrate portions of the backpack that form no part of the claimed design. 

CLAIM The ornamental design for a backpack, as shown and described. 